XML backed JTable

[Charles Burton]

So, before I describe what I'm trying to do I'll give my standard disclaimer. I'm coding to java 1.4 and will not be upgrading for a while. All code posted is handjammed in from a system that is airgapped and may have typos and not be as complete as I would like to make it.

Now, on to what I'm trying to do. I'm trying to make a JTable where one row is backed by a org.w3c.dom.Node. I want to be able to parse that node's attributes/values into the cells for editing. The editing will be done by different component types including JComboBoxes, JTextFields, and JCheckBoxes. Editing changes will be made using these components and reflected in the Node's attributes/values. Let me show you what I have so far.

//How the table is initialized

XMLJTable model = new XMLJTable();
JTable list = new JTable();

TableColumn col = list.getColumnModel().getColumn(0);
col.setCellEditor(new ComboBoxEditor());

TableColumn tCol = list.getColumnModel().getColumn(1);
col.setCellEditor(new TextCellEditor());

list.setModel(model);
model.addColumn("Priority");
model.addColumn("File");
model.addColumn("Role");
model.addColumn("Is Regex");

//Simplified code to show how I'm adding nodes
NodeList errorNodes = ((Element)SELECTEDNODE).getElementsByTagName("file");
Object[] rowData = new Object[4];
for (int i = 0; i < errorNodes.getLength(); i++) {
	Element ele = (Element)errorNodes.item(i);
	//Make each cell that the Node
	for (int k = 0; k < 4; k++) {
		rowData[k] = ele;
	}
	model.addRow(rowData);
}

//My List model
public class XMLJTable extends AbstractListModel {
	Vector data;
	Vector columns;
	
	public int getRowCount() {
		return data.size() / getColumnCount();
	}
	
	public int getColumnCount() {
		return columns.size();
	}
	
	public Object getValueAt(int rowIndex, int columnIndex) {
		Node node = (Node)data.get((rowIndex * getColumnCount()) + columnIndex);
		return node;
	}
	
	public String getColumnName(int col) {
		return (String)columns.get(col);
	}
	
	public Class getColumnClass(int col) {
		return getValueAt(0, col).getClass();
	}
	
	public boolean isCellEditable(int row, int col) {
		return true;
	}
	
	public void addRow(Object[] dataArray) {
		for (int i = 0; i < dataArray.length; i++) {
			data.addElement(dataArray[i]);
		}
	}
}

/*
 *Problem area one.  What I'm doing here is creating a JComboBox based on the information contained in the first cell.
 *The JComboBox has a custom renderer that just places an Icon in it instead of a number.  I want the Icon to show in the
 *cell and whenever someone selects the JComboBox, I want it to reset the attribute on the node which is the cell Value.
*/

private class ComboBoxEditor extends AbstractCellEditor implements TableCellEditor {
	JComboBox comp = null;
	public ComboBoxEditor() {
		comp = priorities();
	}
	
	//This returns the Integer for display in the cell currently, I'm trying to get the Icon to display based on the attribute
	//from the node, not the combobox
	public Object getCellEditorValue() {
		return comp.getSelectedItem();
	}
	
	//Displays the combobox to select the priority
	public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
		Element ele = (Element)value;
		if (comp.getSelectedIndex() == 0) {
			ele.setAttribute("priority", "0");
		} else if (comp.getSelectedIndex() == 1) {
			ele.setAttribute("priority", "1");
		} else if (comp.getSelectedIndex() == 2) {
			ele.setAttribute("priority", "2");
		}
		return comp;
	}
	
	private JComboBox priorities() {
		JComboBox cBox = new JComboBox();
		cBox.setEditable(false);
		cBox.addItem(new Integer(0));
		cBox.addItem(new Integer(1));
		cBox.addItem(new Integer(2));
		//This bit is a custom renderer that takes the integer and make the box display an image
		cBox.setRenderer(new PriorityRenderer()):
		return cBox;
	}
}

/*
 *Problem area two.  What I'm doing here is getting the Node from the table model and displaying it in a JTextField so that it can be edited.
 *What I would like to do is make it so that the edits to the cell update the Node with the information contained in the cell.
 */
 
 private class TextCellEditor extends AbstractCellEditor implements TableCellEditor {
	JTextField field = new JTextField();
	
	public Object getCellEditorValue() {
		return field.getText();
	}
	
	public Component getTableCellComponent(JTable table, Object value, boolean isSelected, int row, int column) {
		Node node (Node)value;
		String text = node.getFirstChild().getNodeValue();
		field.setText(text);
		return field;
	}
 }

Sample XML Node

<file priority="2" role="HW" useregex="false">/var/tmp/somefilehere</file>

[Paul Clapham]

You don't update the backing store based on what happens in the cell editor. You should update it based on what happens in the setValueAt() method of the table model.

[Charles Burton]

Paul Clapham wrote:You don't update the backing store based on what happens in the cell editor. You should update it based on what happens in the setValueAt() method of the table model.

Thanks, that got me on the right track. I'll post some code once I figure it all out.